Scilab Function
Last update : April 1993

parrot - Parrot's problem

### Calling Sequence

  `K=parrot(D,r)`

### Parameters

- `D,K`: matrices
- `r`: 1X2 vector (dimension of the 2,2 part of `D`)

### Description

Given a matrix `D` partionned as `[D11 D12; D21 D22]` where `size(D22)=r=[r1,r2]` compute a matrix `K` such that largest singular value of `[D11 D12; D21 D22+K]` is minimal (Parrot's problem)

### See Also

`h_inf_st`,